target/linux/ipq806x/patches-5.4/0057-add-fab-scaling-support-with-cpufreq.patch

   1 --- a/drivers/clk/qcom/Makefile
   2 +++ b/drivers/clk/qcom/Makefile
   3 @@ -15,6 +15,7 @@ clk-qcom-$(CONFIG_KRAIT_CLOCKS) += clk-k
   4  clk-qcom-y += clk-hfpll.o
   5  clk-qcom-y += reset.o
   6  clk-qcom-$(CONFIG_QCOM_GDSC) += gdsc.o
   7 +clk-qcom-y += fab_scaling.o
   8
   9  # Keep alphabetically sorted by config
  10  obj-$(CONFIG_APQ_GCC_8084) += gcc-apq8084.o
  11 --- /dev/null
  12 +++ b/drivers/clk/qcom/fab_scaling.c
  13 @@ -0,0 +1,172 @@
  14 +/*
  15 + * Copyright (c) 2015, The Linux Foundation. All rights reserved.
  16 + *
  17 + * Permission to use, copy, modify, and/or distribute this software for any
  18 + * purpose with or without fee is hereby granted, provided that the above
  19 + * copyright notice and this permission notice appear in all copies.
  20 + *
  21 + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  22 + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  23 + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  24 + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  25 + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  26 + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  27 + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  28 + */
  29 +
  30 +#include <linux/kernel.h>
  31 +#include <linux/init.h>
  32 +#include <linux/module.h>
  33 +#include <linux/platform_device.h>
  34 +#include <linux/err.h>
  35 +#include <linux/io.h>
  36 +#include <linux/of.h>
  37 +#include <linux/of_device.h>
  38 +#include <linux/clk.h>
  39 +#include <linux/clk-provider.h>
  40 +#include <linux/slab.h>
  41 +#include <linux/fab_scaling.h>
  42 +
  43 +struct qcom_fab_scaling_data {
  44 +       u32 fab_freq_high;
  45 +       u32 fab_freq_nominal;
  46 +       u32 cpu_freq_threshold;
  47 +       struct clk *apps_fab_clk;
  48 +       struct clk *ddr_fab_clk;
  49 +};
  50 +
  51 +static struct qcom_fab_scaling_data *drv_data;
  52 +
  53 +int scale_fabrics(unsigned long max_cpu_freq)
  54 +{
  55 +       struct clk *apps_fab_clk = drv_data->apps_fab_clk,
  56 +                  *ddr_fab_clk = drv_data->ddr_fab_clk;
  57 +       unsigned long target_freq, cur_freq;
  58 +       int ret;
  59 +
  60 +       /* Skip fab scaling if the driver is not ready */
  61 +       if (!apps_fab_clk || !ddr_fab_clk)
  62 +               return 0;
  63 +
  64 +       if (max_cpu_freq > drv_data->cpu_freq_threshold)
  65 +               target_freq = drv_data->fab_freq_high;
  66 +       else
  67 +               target_freq = drv_data->fab_freq_nominal;
  68 +
  69 +       cur_freq = clk_get_rate(ddr_fab_clk);
  70 +
  71 +       if (target_freq != cur_freq) {
  72 +               ret = clk_set_rate(apps_fab_clk, target_freq);
  73 +               if (ret)
  74 +                       return ret;
  75 +               ret = clk_set_rate(ddr_fab_clk, target_freq);
  76 +               if (ret)
  77 +                       return ret;
  78 +       }
  79 +
  80 +       return 0;
  81 +}
  82 +EXPORT_SYMBOL(scale_fabrics);
  83 +
  84 +static int ipq806x_fab_scaling_probe(struct platform_device *pdev)
  85 +{
  86 +       struct device_node *np = pdev->dev.of_node;
  87 +       struct clk *apps_fab_clk, *ddr_fab_clk;
  88 +       int ret;
  89 +
  90 +       if (!np)
  91 +               return -ENODEV;
  92 +
  93 +       drv_data = kzalloc(sizeof(*drv_data), GFP_KERNEL);
  94 +       if (!drv_data)
  95 +               return -ENOMEM;
  96 +
  97 +       if (of_property_read_u32(np, "fab_freq_high", &drv_data->fab_freq_high)) {
  98 +               pr_err("FABRICS turbo freq not found. Using defaults...\n");
  99 +               drv_data->fab_freq_high = 533000000;
 100 +       }
 101 +
 102 +       if (of_property_read_u32(np, "fab_freq_nominal", &drv_data->fab_freq_nominal)) {
 103 +               pr_err("FABRICS nominal freq not found. Using defaults...\n");
 104 +               drv_data->fab_freq_nominal = 400000000;
 105 +       }
 106 +
 107 +       if (of_property_read_u32(np, "cpu_freq_threshold", &drv_data->cpu_freq_threshold)) {
 108 +               pr_err("FABRICS cpu freq threshold not found. Using defaults...\n");
 109 +               drv_data->cpu_freq_threshold = 1000000000;
 110 +       }
 111 +
 112 +       apps_fab_clk = devm_clk_get(&pdev->dev, "apps-fab-clk");
 113 +       ret = PTR_ERR_OR_ZERO(apps_fab_clk);
 114 +       if (ret) {
 115 +               /*
 116 +                * If apps fab clk node is present, but clock is not yet
 117 +                * registered, we should try defering probe.
 118 +                */
 119 +               if (ret != -EPROBE_DEFER) {
 120 +                       pr_err("Failed to get APPS FABRIC clock: %d\n", ret);
 121 +                       ret = -ENODEV;
 122 +               }
 123 +               goto err;
 124 +       }
 125 +
 126 +       clk_prepare_enable(apps_fab_clk);
 127 +       clk_set_rate(apps_fab_clk, drv_data->fab_freq_high);
 128 +       drv_data->apps_fab_clk = apps_fab_clk;
 129 +
 130 +       ddr_fab_clk = devm_clk_get(&pdev->dev, "ddr-fab-clk");
 131 +       ret = PTR_ERR_OR_ZERO(ddr_fab_clk);
 132 +       if (ret) {
 133 +               /*
 134 +                * If ddr fab clk node is present, but clock is not yet
 135 +                * registered, we should try defering probe.
 136 +                */
 137 +               if (ret != -EPROBE_DEFER) {
 138 +                       pr_err("Failed to get DDR FABRIC clock: %d\n", ret);
 139 +                       ddr_fab_clk = NULL;
 140 +                       ret = -ENODEV;
 141 +               }
 142 +               goto err;
 143 +       }
 144 +
 145 +       clk_prepare_enable(ddr_fab_clk);
 146 +       clk_set_rate(ddr_fab_clk, drv_data->fab_freq_high);
 147 +       drv_data->ddr_fab_clk = ddr_fab_clk;
 148 +
 149 +       return 0;
 150 +err:
 151 +       kfree(drv_data);
 152 +       return ret;
 153 +}
 154 +
 155 +static int ipq806x_fab_scaling_remove(struct platform_device *pdev)
 156 +{
 157 +       kfree(drv_data);
 158 +       return 0;
 159 +}
 160 +
 161 +static const struct of_device_id fab_scaling_ipq806x_match_table[] = {
 162 +       { .compatible = "qcom,fab-scaling" },
 163 +       { }
 164 +};
 165 +
 166 +static struct platform_driver fab_scaling_ipq806x_driver = {
 167 +       .probe          = ipq806x_fab_scaling_probe,
 168 +       .remove         = ipq806x_fab_scaling_remove,
 169 +       .driver         = {
 170 +               .name   = "fab-scaling",
 171 +               .of_match_table = fab_scaling_ipq806x_match_table,
 172 +       },
 173 +};
 174 +
 175 +static int __init fab_scaling_ipq806x_init(void)
 176 +{
 177 +       return platform_driver_register(&fab_scaling_ipq806x_driver);
 178 +}
 179 +late_initcall(fab_scaling_ipq806x_init);
 180 +
 181 +static void __exit fab_scaling_ipq806x_exit(void)
 182 +{
 183 +       platform_driver_unregister(&fab_scaling_ipq806x_driver);
 184 +}
 185 +module_exit(fab_scaling_ipq806x_exit);
 186 --- /dev/null
 187 +++ b/include/linux/fab_scaling.h
 188 @@ -0,0 +1,31 @@
 189 +/*
 190 + * Copyright (c) 2015, The Linux Foundation. All rights reserved.
 191 + *
 192 + * Permission to use, copy, modify, and/or distribute this software for any
 193 + * purpose with or without fee is hereby granted, provided that the above
 194 + * copyright notice and this permission notice appear in all copies.
 195 + *
 196 + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 197 + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 198 + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 199 + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 200 + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 201 + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 202 + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 203 + */
 204 +
 205 +
 206 +#ifndef __FAB_SCALING_H
 207 +#define __FAB_SCALING_H
 208 +
 209 +/**
 210 + * scale_fabrics - Scale DDR and APPS FABRICS
 211 + *
 212 + * This function monitors all the registered clocks and does APPS
 213 + * and DDR FABRIC scaling based on the idle frequencies with which
 214 + * it was registered.
 215 + *
 216 + */
 217 +int scale_fabrics(unsigned long max_cpu_freq);
 218 +
 219 +#endif
 220 --- a/drivers/cpufreq/cpufreq-dt.c
 221 +++ b/drivers/cpufreq/cpufreq-dt.c
 222 @@ -20,6 +20,7 @@
 223  #include <linux/regulator/consumer.h>
 224  #include <linux/slab.h>
 225  #include <linux/thermal.h>
 226 +#include <linux/fab_scaling.h>
 227
 228  #include "cpufreq-dt.h"
 229
 230 @@ -111,6 +112,13 @@ static int set_target(struct cpufreq_pol
 231                                         }
 232                                 }
 233                         }
 234 +
 235 +                       /*
 236 +                        * Scale fabrics with max freq across all cores
 237 +                        */
 238 +                       ret = scale_fabrics(target_freq);
 239 +                       if (ret)
 240 +                               goto exit;
 241                 }
 242                 priv->opp_freq = freq * 1000;
 243                 arch_set_freq_scale(policy->related_cpus, freq,